These cast iron butterfly valves are generally used within potable water and heating (cold and hot water) systems. The lug butterfly valves are also suitable for food and chemical industry. The seats are not suitable for mediums having abrasive property (acidity or alkaline property). Resistance to sunlight, weathering and ozone. Poor resistance to petroleum oils and fuel. Good heat and compression set resistance. Suitable for: Less than 10% acids, inorganic and organic alcohols, alkaline salts and solutions, dry bulk, hot-cold water, steam Not suitable for Hydrocarbons